Shape evolution of CdSe nanocrystals in vegetable oils: A synergistic effect of selenium precursor

In this contribution, common vegetable oils are used as coordination solvents for synthesis of high quality CdSe nanocrystals. Various shaped nanocrystals (quantum dots, quantum rods, multipods, arc structure, etc.) can be produced free of alkylphosphonic acids. Shape evolution can be induced by three types of selenium precursors: ODE-Se, VO-Se and TOP-Se (ODE, 1-octadecene; VO, vegetable oil; TOP, trio-n-octylphosphine). The quantum yields of NCs are 15-40%. The full width at half-maximum (fwhm) of the photoluminescence spectra are 27 +/- 1 nm for quantum clots and 23 +/- 1 nm for quantum rods/multipods.

智能涂胶机控制系统设计

本文介绍了一种新型涂胶机控制系统的设计,详细描述了系统的原理和硬件功能。涂胶机是汽车变速箱装配流水线上最重要的部分之一。该机除具有自动涂胶功能、自动检测报警功能外,还能与装配管理系统联网,实现网络化管理与控制功能。整个系统采用运动控制器、伺服电机等控制部件,为变速箱涂胶提供了安全可靠的质量保证。